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Amazon.com: ATEYC Aluminum Tube, 5pcs Aluminum Hollow Round Tubing Tube Connecting Shaft for RC Car Boat Model (Color : 3×2mm, Size : Length 200mm) : Industrial & Scientific
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K&S Engineering 1110 Round Aluminum Tube, 5/32" OD x 0.014" Wall x 36" Long, 5 Pieces, Made in The USA: Metal Industrial Wall Tubing: Amazon.com: Industrial & Scientific
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Tubing, 0.18 in. ID, 1/4 in. OD, Aluminum: Amazon.com: Industrial & Scientific
Amazon.com: uxcell 6063 Aluminum Tube, 4mm 5mm 6mm OD x 1mm Wall Thickness 300mm Length Seamless Round Pipe Tubing, Pack of 3 : Industrial & Scientific
Meter Star 0.24"(6mm) Aluminum Tubing with compression olive Fittings M10x1 female and Male Length 1 meter/39 inch gas water heater parts - - Amazon.com